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doubt in inverse="true/false"

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I was going through an article from the site Mykong site
The purpose of the article is to explain the inverse keyword.

I am not getting the 4th point i.e the topic which has heading

4. inverse=”false” Example

There is an insert egample

When a “Stock” object is saved, Hibernate will generated three SQL statements, two inserts and one update.

I am not getting the point why there needs to be an update at all?
Even if stock is the relationship owner what is the need of update ?

Could anyone please help me in this.
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